package com.travelzen._10.innerclasses;

interface Selector {
	boolean end();
	Object current();
	void next();
}

public class Sequence {
	private Object[] items;
	private int next = 0;
	public Sequence(int size) {
			items = new Object[size];
	}
	public void add(Object x){
		if(next < items.length){
			items[next++] = x;
		}
	}
	private class SequenceSelector implements Selector{
		private int i = 0;
		@Override
		public boolean end() {
			return i == items.length;
		}

		@Override
		public Object current() {
			return items[i];
		}

		@Override
		public void next() {
			if(i < items.length) i++;
		}
	}
	public Selector selector(){
		return new SequenceSelector();
	}
	public static void main(String[] args) {
		Sequence sequence = new Sequence(10);
		for(int i = 0; i < 10; i++){
			sequence.add(Integer.toString(i));
		}
		Selector selector = sequence.selector();
		while(!selector.end()){
			System.out.println(selector.current() + "");
			selector.next();
		}
	}
}
